To effectively fertilize greenhouse vegetables during winter, it's recommended to spray diluted micro-fertilizers onto the leaves. This method is not only cost-effective but also highly efficient in delivering essential nutrients directly to the plants. However, to ensure optimal results, there are several key points to keep in mind during the spraying process.
First and foremost, the concentration of the fertilizer solution must be carefully controlled. Using a solution that's too strong can actually harm the plants rather than help them. For best results, follow these general guidelines: borax or boric acid at 0.05% to 0.25%, ammonium molybdate at 0.02% to 0.05%, zinc sulfate at 0.05% to 0.2%, copper sulfate at 0.01% to 0.02%, and iron sulfate at 0.2% to 1%. Always make sure to mix the solution properly before application.
The timing of the spray is also crucial. Different vegetables and different types of fertilizers may require different application periods. As a general rule, it’s best to spray during the flowering stage, as this is when the plants can most effectively absorb the nutrients.
In terms of volume, you should aim to apply about 40 to 70 liters of solution per acre, ensuring that both the stems and leaves are thoroughly covered. This helps maximize nutrient absorption and ensures even distribution.
It's important to note that foliar feeding shouldn't be done too frequently. A single application may not be enough to meet the plant's needs throughout its entire growth cycle. Therefore, it's generally advisable to spray two to four times, depending on the length of the growing season.
Timing the spray correctly can significantly improve its effectiveness. It’s best to spray in the late afternoon or early evening, especially on cloudy days. This allows the fertilizer solution to stay on the leaves longer, increasing the chances of proper absorption and reducing losses due to evaporation or runoff.
Lastly, if you're mixing the fertilizer with pesticides, be mindful of how the two interact. The combination should support both the nutritional and protective needs of the plants without causing any adverse effects. Always test small batches first to ensure compatibility.
By following these tips, you can ensure that your greenhouse vegetables receive the right amount of nutrients at the right time, leading to healthier plants and better yields.
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